14 June 2002
according to the parameters of the particular collector unit chosen. The following
collector specifications and parameters are needed to complete the design. The
specifications are minimum requirements for any collector under consideration and are
listed for the designer's information; the parameters are variables that may vary
between manufacturers and models. The collector parameters used for the system
design should be included on the drawings.
Flat-plate collector requirements.
(a) Maximum temperature (350 degrees F (177 degrees C) or greater).
(b) Maximum pressure (125 psi (862 kPa) or greater).
(c) Collector performance, y-intercept (0.68 or greater), slope (between
0 and -1.0 Btu per hour per square foot per degree F.).
(d) Copper absorber plate and flow passages.
(e) Black chrome, low emittence absorber surface.
(f) Internal manifold.
(g) Single sheet, low iron, tempered glass cover.
(h) Back and side insulation of fibrous glass, polyisocyanurate or
Flat-plate collector design parameters.
(a) Collector unit area (Ac).
(b) Collector unit dimensions.
(c) Design collector flow rate (CFR).
(d) Pressure drop at design flow rate.
(e) Collector internal manifold diameter (d).
(f) Collector volume.
(a) Array orientation (due south when possible; within 20 degrees of
true south allowed).
(b) Array tilt angle (collectors should be tilted from the horizontal to
within 10 degrees of the site latitude).